import { FormData } from "../adapter";
import { URLSearchParams } from "../adapter";
import { setFormData, setSingleTypeObject } from "../singleTypeObject";
import { BodyTypes } from "../type/BodyTypes";

/* 接收类型对象并转化为 Request 的正常对象的方式 */
export const bodyTransform = (
    body: BodyTypes | null,
    headers: Headers
): BodyInit | null => {
    if (!body) return null;
    switch (body.type) {
        case "form":
            if (!(body.data instanceof FormData)) {
                return setFormData(new FormData(), body.data);
            }
        /** 穿透 */
        case "json":
            headers.set("Content-Type", "application/json");
            return JSON.stringify(body.data);
        case "urlencoded":
            if (!(body.data instanceof URLSearchParams)) {
                return setSingleTypeObject(new URLSearchParams(), body.data);
            }
        /** 穿透 */
        default:
            return body.data as BodyInit;
    }
};